Move to SD Card option missing?

Recently, I reset my phone just to get it sped up and installed the apps I only ever use. But after that, the option to "Move to SD card" is missing under my app manager. It was there before the reset, I could move whatever I want. Now I'm running low on internal storage and I need to move things to my SD. The button isn't greyed out, it's completely gone...!

No, I don't want it rooted. It shouldn't have to be. I even installed App2SD, it shows me all the apps I can move, but when I click them, the button is missing.

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